善于疏肝解郁，调经止痛，理气调中的药物是（）
A.川楝子
B.沉香
C.香附
D.木香
E.枳实
参考答案：C
Miss Li ___as a secretary for five years in the company, and now she is general manager of it. [ ]
A. serves
B. served
C. has served
D. had served
酶免疫测定根据抗原抗体反应后是否要分离结合的与游离的酶标记物而分为下述哪几种类型（）。
A.均相异相
B.同相均相
C.异相固相
D.固相均相
E.固相异相
